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RF/Microwave??

Deal with WiMedia coexistence issues

Posted: 03 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:WiMedia? UWB in-band interference? coexistence issues?

The issue is not whether UWB can cause interference; it is possible to construct usage models that interfere with other systems. The debate is over whether these usage models are relevant and whether the interference is serious enough to warrant protection of the victim service.

While out-of-band emissions from WiMedia UWB systems may create negligible interference, in-band (3-5GHz) transmission levels are at -41.3dBm/MHz, so these bear further analysis. In general, there are two types of systems that we can consider as incumbent services in this band: downlink-only systems, receive-only systems that have no local uplink signal; and transceiver systems, which have both a downlink signal from a hub and a local uplink signal returning to the hub.

Downlink-only systems such as C-band satellite and radio astronomy pose unique problems for coexistence because there is no practical way to detect the presence of a receiver.

Please view the PDF document for more information.




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